Tack-driving machine



ma am (No Model) H. E. STEVENS.

TACK DRIVING MACHINE.

No. 561,838. Patented June 9, 1896.

\X/a IJESE EE:

ANDREW B GRAHAM. PNOTOUTMQWASHINGTUNDC UNITED STATES PATENT rricn.

LASTING MACHINE COMPidNY,

OF BOSTON, MASSACHUSETTS.

TACK-DRIVING MACHINE.

SPECIFICATION forming part of Letters Patent No. 561 ,833, dated June 9, 1896. Application filed Aprill, 1895. Serial No. 544,007. (No model.)

To all whont it may concern:

Be it known that I, HENRY E. Srnvnns, of Lynn, in the county of Essex and State of Massachusettsflrave invented certain new and useful Improvements in Tack-Driving Machines, of which the following is a specification.

This invention relates to tack-delivering devices for use in machines adapted to drive tacks into boot or shoe uppers and soles in the operation of lasting, the machine having a tack-delivering nozzle which receives the tacks one at a time and presents them to a reciprocating driver which is forced into the nozzle and drives the tack therefrom into the upper and sole of a shoe mounted on a last and presented to the lower end of the nozzle. In a machine of this class the depth to which the tacks are driven is determined by the relative positions of the work-supporting end of the nozzle and the end of the driver when the latter is at the extreme of its downward movement. It is often desirable to vary the depth of penetration of the tack, or, in other words, the projection of the head of the tack above the outer surface of the upper, some kinds of work requiring a greater projection of the tack-head than others. In some kinds of workit is desirable to drive the tacks more deeply at the heel portion than elsewhere, in order that the heel-tacks may remain in place in the completed boot or shoe after the lastin g operation ,i-he other tacks being pulled out.

My invention has for its object to enable the tack-delivering nozzle to be readily adjusted, so that the operator may readily regulate the depth of penetration of the tack at any time during the operation of lasting, and thus cause some of the tacks to be partially and others wholly driven. To this end the invention consists in a tack-driving machine comprising a supporting-frame, a reciprocating driver, a yieldingly-mounted tack-delivering nozzle movable on the supporting-frame in the direction of movement of the driver, and two interchangeable stops located at different heights, each adapted to positively arrest the upward movement of the nozzle, so that the tacks may be either driven home, their heads bearing on the face of the work,

or only partially driven, their heads standing out from the work.

The invention also consists in certain incidental features, all of which 1 will now proceed to describe and claim.

Of the accompanying drawings, forming a part of this specification, Figure 1 is a side elevation of a portion of a lasting-machine provided with my improvement. Fig. 2 is an end view of the same. Fig. 3 is a viewsimi- 6o lar to the lower portion of Fig. 1, with the mechanism arranged to drive the tack so as to leave the head projecting. Fig. 4 is a view similar to Fig. 3, with the mechanism arranged to drive the tack home, as in the heel 6 5 portion. Fig. 5 is a section on line 5 5 of Fig. 2, looking downwardly. Fig. 6 is a sec tion on line 6 6, Fig. 3. Fig. 7 isa section on line 7 7, Fig. 4.

In the drawings, A represents a portion of 70 the frame of a tack-driving 1asting-machine, and B represents the reciprocating driver which drives the tacks into the upper and inner sole of a boot or shoe.

The machine may be of any suitable con- 7 5 struction and is provided with suitable means for supplying the tacks to the driver.

(1- represents the throat or nozzle, through which the tacks are driven by the driver, as usual, the lower end of said nozzle constitut- 8o ing a rest against which the work is held by the operator.

It will be understood that the machine is or may be provided with suitable mechanism for supplying tacks to the throat a, the tacks be- 8 5 ing supplied automatically and in such manner that at each descent of the driver a tack is delivered to the nozzle in time to be driven therefrom by the driver. The nozzle a is affixed to a holder 1), which is formed as a slide 0 fitted to move vertically in guides on the frame of the machine, so that the nozzle is adapted to move to a limited extent in the direction of movement of the driver, the upward movement of the nozzle being limited 5 by a fixed stop or shoulder A on.the frame of the machine.

In machines now in common use the let-off mechanism which supplies tacks to the nozzle is operated by the upward movement of the ICO nozzle, the latter being normally depressed below the shoulder A, so that it is free to be moved upwardly by the upward pressure of the work against it, so that the operator can cause the insertion of a tack into the work at any desired point by forcing the work upwardly against the nozzle, the latter being thus forced upwardly until it meets the shoulder A and in its upward movement actuating rest at different heights and thus varying the depth of insertion of the tacks.

In carrying out my present invention I provide two interchangeable stops located at different heights relatively to the path of the driver and each adapted to positively arrest the upward movement of the nozzle, so that the operator can cause a varying depth of insertion of the tacks. In the embodiment of my invention here shown one of said stops is the fixed shoulder A, while the other is an arm 0, pivoted at c to the frame of the machine and adapted to swing under the shoulder A and thus become interposed between said shoulder and the nozzle,'said arm being movable into and out of the path in which the nozzle moves. VV'hen the movable stop is thus interposed, it shortens the upward movement of the nozzle, so'that the latter'supports the work below the lower end of the driver, the tacks being therefore left with th-ei'rheads projecting from the work, as shown in Fig. 3. When the movable stop is displaced, as shown by dotted lines in Fig. 5, it permits the nozzle to move upwardly to the fixed stop A, thus causing the tacks to be driven home, as shown in Fig. 4.'

I claim- 1. A tack-driving machine comprising a supporting-frame, a reciprocating driver, a tack-delivering nozzle movable on the supporting-frame in the direction of movement of the driver, and a stop device located above the delivering end of the nozzle and movable into and out of the path in which the nozzle moves.

2. In a tack-driving machine, the combination with .a reciprocating driver, of a work rest composed of a tack delivering nozzle which is movable in the direction of move ment of the driver, a fixed shoulder or support arranged to hold the nozzle in one position, and a movable support adapted to be interposed between the nozzle and the fixed support.

8. In atack-driving machine, the combination of a reciprocating driver, a slide movable on the frame of the machine in the direction of movement of the driver, a tack-guiding throat affixed to said slide, and a stop orsup port pivoted to the supporting-frame and adapted to limit the-upward movement of the slide and nozzle.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this 26th day of March, A. D. 1895.

HENRY 1. STEVENS. lVitnesses ERNEST D. LIBBEY, YVINFIELD S. WALKER. 

